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U2400B Dataheets PDF



Part Number U2400B
Manufacturers Vishay Telefunken
Logo Vishay Telefunken
Description Charging of Batteries with Automatic Pre-Discharge
Datasheet U2400B DatasheetU2400B Datasheet (PDF)

U2400B Charging of Batteries with Automatic Pre-Discharge Description The monolithic integrated circuit, U2400B, is a bipolar circuit, designed for automatic recharging of NiCd/ NiMH batteries. It has controlled and defined charging characteristics for various charging sequences with *subsequent trickle charge operation. The long life *Memory Effect of the recharging cell remains intact. Features D Three time selections: 0.5 h, 1 h or 12 h with subsequent trickle charge operation D Battery te.

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U2400B Charging of Batteries with Automatic Pre-Discharge Description The monolithic integrated circuit, U2400B, is a bipolar circuit, designed for automatic recharging of NiCd/ NiMH batteries. It has controlled and defined charging characteristics for various charging sequences with *subsequent trickle charge operation. The long life *Memory Effect of the recharging cell remains intact. Features D Three time selections: 0.5 h, 1 h or 12 h with subsequent trickle charge operation D Battery temperature and contact monitoring D Charging interrupt for overvoltage or excessive temperature D Automatic pre-discharge possible D Separate charge- and discharge outputs D Pulse-width modulation facility of charge- and discharge current for matching to transformer or battery data D Timer clock via mains or internal oscillator D Reference voltage source D LED-status output for mode indication Case: DIP16, SO16L 8 14 16 0.5 Hz 94 9375 11 Mains supply 7 Reference Open Ref on off Test logic Mains synchronization 1 3 200 Hz Oscillator – 2+ Control unit PWM Time Status Discharge Reset 13 Ref 12 h GND 1 h Charge time selection Open 0.5 h Failure – charge mode II Continue Alternating 15 Ref charging red / green I Stop Red Open charging indicator Status display output 9 Charge Start Stop Charge output 12 Discharge stop 0.53 V + –6 0.53 V + – Sensor monitoring 5 + – 2.95 V Event counter Vmax 0.53 V – +4 Battery contact monitoring – + 0.18 V 10 Discharge output Figure 1. Block diagram TELEFUNKEN Semiconductors Rev. A2, 21-Nov-96 1 (15) TELEFUNKEN Semiconductors Rev. A1, 21-Nov-96 2 (15) Figure 2. 220 mF 10 mF V Ref 430 kW C1 11 C3 7 R1 3 15 nF C2 2 B1 13 B2 open 15 +V S 8 Mains supply Reference 14 Open on Ref off 16 0.5 Hz Test logic 94 9376 Mains synchronization 1 D2 ... D5 BYX86 D1 BYX86 G A1 A2 V = 12 V~ 200 Hz Oscillator Control unit PWM Time Status Discharge Reset Ref GND Open 12 h 1h 0.5 h Charge time selection Failure – charge mode II Continue Alternating Ref charging red / green I Stop Red Open charging indicator Status display output 9 Charge Start Stop Charge output 12 Discharge stop 0.53 V + –6 0.53 V + – Sensor monitoring 5 + – 2.95 V Event counter V max Battery contact monitoring Discharge output 0.53 V – +4 – + 0.18 V 10 R7 TLHR5400 TLHG5400 R6 330 W red green 330 W R9 220 W WR 5 100 k 0.33 mF C5 WR3 10 k R 13 V Ref WR6 30 k R 17 1.5 kW W0.33 mF R4 100 k VBattery = 7.2 V WR2 C4 5.6 k R 14 1 kW R 10 10 kW T1 BD135 R 12 NTC Sensor M 87 WR(25) = 10 k U2400B U2400B General Description, Figures 2 and 3 The integrated circuit, U2400B, supports specially the controlled and defined charging of fast NiCd cells. Varieties of charging time selections, i.e., standard charge (12 h), quick charge (1 h) or fast charge (0.5 h) are possible. Before the charging begins, cell is discharged completely. * *In this way, the long life Memory Effect of the recharging cell remains intact. Surveillance is taken over by control unit for time, thermal and voltage during the charging and switch-off when the specified capacity is attained. When switched on, the red LED connected to the display output (Pin 9) is activated. This is only the case if no battery is connected. When a battery is inserted with a minimum voltage of approximately 180 mV at Pin 4, the pre-discharge phase is then started with a 2 seconds delay. The discharge output at Pin 10 is activated. This is indicated by the flashing red LED (see figure 5). The discharge procedure is stopped with a voltage less than 530 mV (at Pin 6). The following charge phase (charge output Pin 12 active) is indicated by the flashing green LED (Pin 9). After the programmed charging period (Pin 13: 0.5 or 1 h continuous charge, or 12 h pulsed charge) the trickle charge phase is reached (figure 4). This trickle charge mode is indicated by the on-state of the green LED. This means, the battery has stored the maximum possible *amount of energy. The outputs display, discharge and *charge will be set inactive (by temperature, over- voltage). The timer clock is interrupted during the inactive phase and in each mode when a limit value (Pins 4 and 5) is exceeded. START Reset no Pin 9: “0” Battery inserted ? yes Pin 9: “open” Pin 9: Alternating blinking yes Pin 15 = VRef no Pin 9: “0” Trickle charge Pin 12: “0” pulsed Pin 10: open Pin 9: “1” yes no Time t > tmax ? yes no Event counter Z<2? V < Vmax ? no STAND – BY Increment event counter Pin 12: open Pin 9: open Pin 10: open Timer stop yes no yes T < Tmax ? Discharge Pin12: open Pin 9: “0” pulsed Pin 10 “1” Timer stop no “Discharged” memory set ? no yes Charge Pin 12: “1” pulsed Pin 9: “1” pulsed Pin 10: open Timer run Figure 3. Flow chart V < Vmin ? yes Set “discharged” memory 94 9377 TELEFUNKEN Semiconductors Rev. A2, 21-Nov-96 3 (15) U2400B A two-stage event counter will be incremented with each limit value violation. If the .


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